Diffusion versus Double Crushing. 233 



equal qualities of cane worked up by both processes in 

 this case with 13*13 0/0 sugar. That my plan for show- 

 ing comparisons between both methods holds good also 

 if the cane is of different qualities is obvious ; besides I 

 am in possession of figures which show this pra6lically. 

 The yield of I3'i3 0/0 of sugar in the cane has been 

 accidentally almost identical with the average yield of 

 sugar in the cane during the last five years. 



By a glance at the above schedule you will see that 

 from 100 tons cane we obtained 1*67 tons or 21 0/0 

 more ist sugar by diffusion than we obtained by double 

 crushing = 72 0/0 on the weight of the cane. 



This surplus of 21 0/0 ist sugar is by no means a 

 mere theoretical possibility, but a pra6lically attainable 

 figure. It has been reached in the buildings of this 

 colony which work by diffusion. That this increased 

 recovery has not been of long duration, and especially that 

 it did not become visible to the outside world by a con- 

 siderable clearance of money, is exclusively a matter 

 conne6led with local and intimate conditions on the 

 estates in question, which need not prevent anybody from 

 availing himself of the blessings of a thoroughly good, 

 solid and promising process, independent and unhindered 

 by another's individual drawbacks. 



In order to compare diffusion with double crushing, we 

 require to know in the first place, the recovery of parts 

 sugar in the juice. Double crushing gave 8i'8i, dilTu- 

 sion g*ve 96*64, that is to say, 18.12 0/0 more sugar has 

 been obtained of the sugar in the cane. 



Secondly, the recovery of parts sugar in the massecuite 

 from 100 parts sugar in the canes ; with double crushing 

 we received 75-4 0/0 with diffusion 91-01 0/0, that means 



